6 minute read

I read a great blog post about answering the question how big is the database using T-SQL on SQL Buffet and wondered how much I could do with the dbatools module

The dbatools module (for those that don’t know) is a PowerShell module written by amazing folks in the community designed to make administrating your SQL Server significantly easier using PowerShell. The instructions for installing it are available here It comprises of 182 separate commands at present (11 March 2017 Version 0.8.938)

I know that there is a Get-DBADatabaseFreeSpace Command written by Mike Fal b t and using Glenn Berry’s diagnostic queries)

First thing as always is to look at the help

` Get-Help Get-DbaDatabaseFreespace -ShowWindow`

which will show you the help for the command and some examples

Lets look at the details for a single instance

` Get-DbaDatabaseFreespace -sqlserver $server`

This is what it looks like

02 - singel server.gif

and yes it really is that fast, I have not speeded this up. 232 ms to get those details for an instance with 19 databases

03 - Measure Command.PNG

What information do you get ? Lets look at the information for a single database, you get an object for each file

Server               : SQL2014SER12R2  
Database             : DBA-Admin  
FileName             : DBA-Admin_System  
FileGroup            : PRIMARY  
PhysicalName         : F:\DBA-Admin_System.MDF  
FileType             : ROWS  
UsedSpaceMB          : 3  
FreeSpaceMB          : 253  
FileSizeMB           : 256  
PercentUsed          : 1  
AutoGrowth           : 0  
AutoGrowType         : MB  
SpaceUntilMaxSizeMB  : 16777213  
AutoGrowthPossibleMB : 0  
UnusableSpaceMB      : 16777213

Server               : SQL2014SER12R2  
Database             : DBA-Admin  
FileName             : DBA-Admin_Log  
FileGroup            :  
PhysicalName         : G:\DBA-Admin_Log.LDF  
FileType             : LOG  
UsedSpaceMB          : 32  
FreeSpaceMB          : 224  
FileSizeMB           : 256  
PercentUsed          : 12  
AutoGrowth           : 256  
AutoGrowType         : MB  
SpaceUntilMaxSizeMB  : 2528  
AutoGrowthPossibleMB : 2304  
UnusableSpaceMB      : 0

Server               : SQL2014SER12R2  
Database             : DBA-Admin  
FileName             : DBA-Admin_User  
FileGroup            : UserFG  
PhysicalName         : F:\DBA-Admin_User.NDF  
FileType             : ROWS  
UsedSpaceMB          : 1  
FreeSpaceMB          : 255  
FileSizeMB           : 256  
PercentUsed          : 0  
AutoGrowth           : 256  
AutoGrowType         : MB  
SpaceUntilMaxSizeMB  : 5119  
AutoGrowthPossibleMB : 4864  
UnusableSpaceMB      : 0

There is a lot of useful information returned for each file. Its better if you use Out-GridView as then you can order by columns and filter in the top bar.

04 - single server ogv.gif

As always, PowerShell uses the permissions of the account running the sessions to connect to the SQL Server unless you provide a separate credential for SQL Authentication. If you need to connect with a different windows account you will need to hold Shift down and right click on the PowerShell icon and click run as a different user.

Lets get the information for a single database. The command has dynamic parameters which populate the database names to save you time and keystrokes

05 dynamic parameters.gif

But you may want to gather information about more than one server. lets take a list of servers and place them into a variable. You can add your servers to this variable in a number of ways, maybe by querying your CMDB or using your registered servers or central management server

$SQLServers = 'SQL2005Ser2003','SQL2012Ser08AG3','SQL2012Ser08AG1','SQL2012Ser08AG2','SQL2014Ser12R2','SQL2016N1','SQL2016N2','SQL2016N3','SQLVnextN1','SQLvNextN2'

and then

Get-DbaDatabaseFreespace -SqlInstance $SQLServers | Out-GridView

06 - Many servers ogv.PNG

As you can see, you get a warning quite correctly, that the information for the asynchronous secondary node of the availability group databases is not available and I did not have all of my servers running so there are a couple of could not connect warnings as well. You can still filter very quickly. dbatools is tested from SQL2000 to SQL vNext as you can see below (although I don’t have a SQL2000 instance)

07 - filter ogv

Not only on Windows, this command will work against SQL running on Linux as well

08 - linux.PNG

So if we want to know the total size of the files on disk for  the database we need to look at the FileSizeMB property

$server = 'SQL2014Ser12R2'
$dbName = 'AdventureWorksDW2014'
Get-DbaDatabaseFreespace -SqlServer $server -database $dbName |
Select Database,FileName,FileSizeMB

Of course that’s an easy calculation here

08a - filesize.PNG

but if we have numerous files then it may be tougher. we can use the Measure-Object command to sum the properties. We need to do a bit of preparation here and set a couple of calculated properties to make it more readable

$server = 'SQL2014Ser12R2'
$dbName = 'AdventureWorksDW2014'
$database = @{Name = 'Database'; Expression = {$dbname}}
$FileSize = @{Name = 'FileSize'; Expression = {$_.Sum}}
Get-DbaDatabaseFreespace -SqlServer $server -database $dbName |
Select Database,FileSizeMB |
Measure-Object FileSizeMB -Sum |
Select $database ,Property, $filesize

09 - filessize

Maybe we want to look at all of the databases on an instance. Again, we have to do a little more work here

$server = 'SQL2014Ser12R2'
$srv = Connect-DbaSqlServer $server
$SizeonDisk = @()
$srv.Databases |ForEach-Object {
$dbName = $_.Name
$database = @{Name = 'Database'; Expression = {$dbname}}
$FileSize = @{Name = 'FileSize'; Expression = {$_.Sum}}
$SizeOnDisk += Get-DbaDatabaseFreespace -SqlServer $server -database $dbName | Select Database,FileSizeMB |  Measure-Object FileSizeMb -Sum | Select $database ,Property, $Filesize
}
$SizeOnDisk

10 - size on disk

If we wanted the databases ordered by the size of their files we could do this

$SizeOnDisk |Sort-Object Filesize -Descending

11 - size sorted.PNG

As it is PowerShell we have an object and we can use it any way we like. Maybe we want that information in a text file or a csv or an excel file or in an email, PowerShell can do that

 ## In a text file
$SizeonDisk | Out-file C:\temp\Sizeondisk.txt
Invoke-Item C:\temp\Sizeondisk.txt
## In a CSV
$SizeonDisk | Export-Csv C:\temp\Sizeondisk.csv -NoTypeInformation
notepad C:\temp\Sizeondisk.csv
## Email
Send-MailMessage -SmtpServer $smtp -From [email protected] -To [email protected] `
-Subject "Smurf this needs looking At" -Body $SizeonDisk
## Email as Attachment
Send-MailMessage -SmtpServer $smtp -From [email protected] -To [email protected] `
-Subject "Smurf this needs looking At" -Body "Smurf" -Attachments C:\temp\Sizeondisk.csv

I had a little play with Boe Prox PoshCharts (you have to use the dev branch) to see if I could get some nice charts and unfortunately the bar charts did not come out so well but luckily the donut and pie charts did. (I’m a DBA I love donuts!)

$SizeonDisk| Out-PieChart -XField Database -YField FileSize -Title "UsedSpaceMB per Database on $Server" -IncludeLegend -Enable3D
$SizeonDisk| Out-DoughnutChart -XField Database -YField FileSize -Title "UsedSpaceMB per Database on $Server" -IncludeLegend -Enable3D

12 - donuts.PNG

So the point is, whatever you or your process requires you can pretty much bet that PowerShell can enable it for you to automate.

You can make use of all of the properties exposed by the command. If you want to only see the files with less than 20% space free

` Get-DbaDatabaseFreespace -SqlServer $server Where-Object {$_.PercentUsed -gt 80}`

13 - percent used.PNG

you can also use the command to check for file growth settings as well

` Get-DbaDatabaseFreespace -SqlServer $server Where-Object {$_.AutoGrowType  -ne ‘Mb’}`

14 - autogrowth.PNG

Or maybe you want to know the FileSize, Used and Free Space per database

 $server = 'SQL2014Ser12R2'
$srv = Connect-DbaSqlServer $server
$SizeonDisk = @()
$srv.Databases |ForEach-Object {
$dbName = $_.Name
$database = @{Name = 'Database'; Expression = {$dbname}}
$MB = @{Name = 'Mbs'; Expression = {$_.Sum}}
$SizeOnDisk += Get-DbaDatabaseFreespace -SqlServer $server -database $dbName | Select Database,FileSizeMB, UsedSpaceMB, FreeSpaceMb |  Measure-Object FileSizeMb , UsedSpaceMB, FreeSpaceMb -Sum  | Select $database ,Property, $Mb
}
$SizeOnDisk 

15 totals.PNG

Hopefully that has given you a quick insight into another one of the fabulous dbatools commands. Any questions, comment below or head over to the SQL Server Community Slack via https://sqlps.io/slack

Happy Automating

NOTE – The major 1.0 release of dbatools due in the summer 2017 may have breaking changes which will stop the above code from working. There are also new commands coming which may replace this command. This blog post was written using dbatools version 0.8.942 You can check your version using

` Get-Module dbatools`

and update it using an Administrator PowerShell session with

Update-Module dbatools

You may find that you get no output from Update-Module as you have the latest version. If you have not installed the module from the PowerShell Gallery using

 Install-Module dbatools

Then you can use

 Update-dbatools

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